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Finding the Fourth Proportional to 70,521.78, 105,783.06 and 17,931.30

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Solution

The fourth proportional to 70,521.78, 105,783.06 and 17,931.30 is: 26,897.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,521.78 : 105,783.06 = 17,931.30 : x
  2. Step 2: Convert to fraction form
    70,521.78/105,783.06 = 17,931.30/x
  3. Step 3: Cross multiply
    70,521.78x = 105,783.06 × 17,931.30
  4. Step 4: Simplify right side
    70,521.78x = 1,896,827,783.78
  5. Step 5: Solve for x
    x = 1,896,827,783.78/70,521.78
  6. Step 6: Final answer
    x = 26,897.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.